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#define _POSIX_C_SOURCE 200809L
#include "cftw.h"
#include <dynstr.h>
#include <dirent.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
struct cftw_entry
{
DIR *d;
char *dirpath;
struct cftw_entry *child;
};
struct cftw
{
bool done;
char *dirpath;
int (*fn)(const char *, const struct stat *, bool *, void *);
void *user;
struct cftw_entry *root;
};
static int free_entry(struct cftw_entry *const e)
{
int ret = 0;
if (e->d && closedir(e->d))
{
fprintf(stderr, "%s: closedir(2) %s: %s\n", __func__, e->dirpath,
strerror(errno));
ret = -1;
}
free(e->dirpath);
free(e);
return ret;
}
void cftw_free(struct cftw *const c)
{
if (!c)
return;
for (struct cftw_entry *e = c->root; e;)
{
struct cftw_entry *const child = e->child;
free_entry(e);
e = child;
}
free(c->dirpath);
free(c);
}
static struct cftw_entry *entry(const char *const dirpath)
{
struct cftw_entry *ret = NULL;
char *dirdup = NULL;
DIR *const d = opendir(dirpath);
if (!d)
{
fprintf(stderr, "%s: opendir(2) %s: %s\n", __func__, dirpath,
strerror(errno));
goto failure;
}
else if (!(dirdup = strdup(dirpath)))
{
fprintf(stderr, "%s: strdup(3): %s\n", __func__, strerror(errno));
goto failure;
}
else if (!(ret = malloc(sizeof *ret)))
{
fprintf(stderr, "%s: malloc(3): %s\n", __func__, strerror(errno));
goto failure;
}
*ret = (const struct cftw_entry)
{
.dirpath = dirdup,
.d = d
};
return ret;
failure:
if (d && closedir(d))
fprintf(stderr, "%s: closedir(2) %s: %s\n", __func__, dirpath,
strerror(errno));
free(dirdup);
free(ret);
return NULL;
}
static enum cftw_state run(struct cftw *const c, struct cftw_entry *const e,
struct cftw_entry *const root)
{
int error = 0;
struct dirent *de;
struct dynstr d;
const char *const dirpath = e->dirpath;
struct stat sb;
dynstr_init(&d);
errno = 0;
de = readdir(e->d);
if (errno)
{
fprintf(stderr, "%s: readdir(3): %s\n", __func__, strerror(errno));
goto failure;
}
else if (!de)
{
if (e == root)
return CFTW_OK;
else if (stat(dirpath, &sb))
{
fprintf(stderr, "%s: stat(2) %s: %s\n", __func__, dirpath,
strerror(errno));
goto failure;
}
return c->fn(dirpath, &sb, &c->done, c->user) ? CFTW_FATAL : CFTW_OK;
}
const char *const path = de->d_name;
if (!strcmp(path, ".") || !strcmp(path, ".."))
return CFTW_AGAIN;
const char *const sep = dirpath[strlen(dirpath) - 1] == '/' ? "" : "/";
if (dynstr_append(&d, "%s%s%s", dirpath, sep, path))
{
fprintf(stderr, "%s: dynstr_append failed\n", __func__);
goto failure;
}
const int r = stat(d.str, &sb);
if (r)
{
fprintf(stderr, "%s: stat(2) %s: %s\n", __func__, path,
strerror(errno));
goto failure;
}
else if (S_ISDIR(sb.st_mode))
{
if (!(e->child = entry(d.str)))
goto failure;
}
else if (S_ISREG(sb.st_mode))
error = c->fn(d.str, &sb, &c->done, c->user);
else
{
fprintf(stderr, "%s: unexpected st_mode %ju\n",
__func__, (uintmax_t)sb.st_mode);
goto failure;
}
dynstr_free(&d);
if (error)
return CFTW_FATAL;
else if (c->done)
return CFTW_OK;
return CFTW_AGAIN;
failure:
dynstr_free(&d);
return CFTW_FATAL;
}
static enum cftw_state step(struct cftw *const c, struct cftw_entry *const e,
struct cftw_entry *const root)
{
if (e->child)
{
switch (step(c, e->child, root))
{
case CFTW_AGAIN:
return CFTW_AGAIN;
case CFTW_FATAL:
free_entry(e->child);
return CFTW_FATAL;
case CFTW_OK:
if (free_entry(e->child))
return CFTW_FATAL;
e->child = NULL;
break;
}
return CFTW_AGAIN;
}
return run(c, e, root);
}
enum cftw_state cftw_step(struct cftw *const c)
{
return step(c, c->root, c->root);
}
struct cftw *cftw(const char *const dirpath, int (*const fn)(const char *,
const struct stat *, bool *, void *), void *const user)
{
struct cftw *ret = NULL;
char *const dirdup = strdup(dirpath);
if (!dirdup)
{
fprintf(stderr, "%s: strdup(3): %s\n", __func__, strerror(errno));
goto failure;
}
else if (!(ret = malloc(sizeof *ret)))
{
fprintf(stderr, "%s: malloc(3): %s\n", __func__, strerror(errno));
goto failure;
}
*ret = (const struct cftw)
{
.dirpath = dirdup,
.fn = fn,
.user = user,
.root = entry(dirpath)
};
if (!ret->root)
goto failure;
return ret;
failure:
free(dirdup);
free(ret);
return NULL;
}
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